Sumy Weather in December
December in Sumy sees daytime temperatures around 0°C (32°F) and lows of -6°C (21°F) at night. Pack a rain jacket because some snow/rainfall is likely.
Rainfall in Sumy in December
Past climate data indicates that roughly 15 days will see snow/rain, totalling around 50 mm (2 in) for the month. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Sumy in December
In December, Sumy gets very low temperatures, with highs of 0°C (32°F). Nights cool to around -6°C (21°F). Experience the winter season in December. Staying warm is the main priority this month, especially during mornings and evenings. Nights are well below freezing at -6°C (21°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation. It's a frigid month, so wearing warm clothing is crucial. Don't underestimate the cold; prepare accordingly.December in Sumy has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ukraine, check out our Sumy's climate page.
Sumy Temperature in December
Min Temperature
-6°C (21°F)
Max Temperature
0°C (32°F)
Chance of Rain
51%
Precipitation
50 mm (2 in)
Rainy days
15 days
Humidity
86%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sumy typically stay consistent throughout December, with daily highs averaging around 0°C (32°F). Nights are very cold, with lows typically ranging from -7°C (19°F) to -4°C (25°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Sumy in December
Browse day-by-day weather records for Sumy spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sumy historical weather extremes in December
Based on 49 years of weather observations in Sumy between 1976 and 2025, these are the recorded extremes.
- The warmest day in December was on December 5, 2008, with a maximum of 12°C (54°F).
Best Places in Ukraine in December
Find out more about the weather in Ukraine and which places have the best travel conditions in this month. See all of Ukraine in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Sumy in December
We recommend to layer up for chilly conditions in Sumy in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. Rain is likely on several days, so bring a good rain jacket.What To Do in Sumy in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ukraine, check out our Sumy's climate page.
See the full Sumy climate overview or explore weather in Ukraine.
